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Answer:
r^2 - s = 14 + 9i
Step-by-step explanation:
r^2 = 4^2 + 8i + i^2
r^2 = 16 + 8i - 1
r^2 = 15 + 8i
r^2 - s = 15 + 8i - (1 - i)
r^2 - s = 15 + 8i - 1 + i
r^2 - s = 14 + 9i